I have recently been watching as little critter that crawl over the glass on my new fish only tank have mutliplied like crazy. I can only guess they are Amphipods. I wish I could get a good pic, but they are only about 1mm in length and even with my little loop I can't get a shot that can be seen.
Back Story for those who are interested:
A few months ago I set up a 130 gallon tank to be a fish only. It had about 100lbs of Utah Oolitic sand and about 150 lbs of LBTR. This was supplemented with about 25 lbs of live rock from my reef and 20 lbs of live sand from my reef refugium.
Anyway the whole thing was a bomb the first time around. I lost all my fish and in trying to help them took out all the rock and sand so I could effectively Copper the tank. I have now had an empty tank for about a month. No fish, no sand, no rock
I haven't worried too much about cleaning the glass or anything else, but just recently I noticed a bunch of little critters on the glass. Literally thousands of them mostly gathered around the spots of algae. They have multiplied very quickly with nothing in the tank to eat them. Under the loop they sort of look like little shrimp , but are still so tiny I can't get a really good look at them.
Are these likely amphipods or something else?